Tisamenus spadix is a stick insect species from the family of Heteropterygidae endemic to the Philippine island of Panay.

Three other specimens collected by Richard Crittenden McGregor were also examined, including an adult female, which is referred to as the allotype.

All three are deposited as paratypes, together with the holotype, at the Academy of Natural Sciences of Drexel University in Philadelphia.

The genus-typical triangle on the mesonotum is wider than it is long in females and longer than it is wide in males.

The head is rectangular and slightly longer than wide, with clearly prominent, almost spherical eyes.

On the head there are low keels (carinae), which end posteriorly in rather strong, supraorbital spines.

Its front corners end in large, conspicuous, slightly forward-facing double spines.

Behind it, starting from the rear corner of the triangle, there is a clear longitudinal keel that continues across the entire metanotum and the segments of the abdomen.